【正确答案】 D

【答案解析】[听力原文]
There is an anecdote about Mark Twain, which goes as follows: in addition to being very famous as a writer, Mark Twain was also famous in his day as a lecturer and a teller of funny stories. He frequently went from town to town giving lectures with a series of funny stories. One day he was walking down the street of a small town where he was going to deliver a lecture that evening. He met a young man who told him that he had an old uncle who never laughed and never smiled. Mark Twain told the young man to bring his uncle to his lecture that evening. He said he would surely make him laugh.
That evening the young man and his uncle sat in the first row. Mark Twain spoke directly to them. He told some rather funny stories, but the old man never even smiled. Then Mark Twain told the funniest stories he ever knew, but the old man"s face still remained blank. Mark Twain left the platform almost exhausted.
Later Mark Twain told a friend about the incident.
"Oh!" said the friend. "You could have saved yourself all your trouble. The old man has been deaf for years."